diff --git a/src/api/bad.py b/src/api/bad.py
new file mode 100644
index 0000000..aed5cc6
--- /dev/null
+++ b/src/api/bad.py
@@ -0,0 +1 @@
+# Bad implementation
diff --git a/src/api/healthz.py b/src/api/healthz.py
new file mode 100644
index 0000000..a9e4547
--- /dev/null
+++ b/src/api/healthz.py
@@ -0,0 +1,9 @@
+"""Health check endpoint."""
+from fastapi import APIRouter
+
+router = APIRouter()
+
+@router.get("/api/healthz")
+async def healthz():
+    """Lightweight health check."""
+    return {"status": "ok"}